Kurt Grandis was plagued by an endless offensive of squirrels against his birdfeeder. He needed a solution, so he programmed sensors to detect the shape and color of squirrels -- and only squirrels -- then instruct a Super Soaker water gun to shoot them. Skip to 16:00 to see it in action.

"...He programmed sensors to detect the shape and color of squirrels..."

Not too far from programming sensors to detect the shape and color of humans. The British have already made a Skynet, there's the creepy robot hand earlier and now animal sensing technology. We're just daring the machines now:)